Re: FreeBSD > 4.11 hardware issue with Asus PSCH-SR/SATA mobo

Begin <e6kbrh$192k$1@xxxxxxxxxxxxxxxxxx>
On 2006-06-12, Chronos <chronos@xxxxxxxxxxxxxx> wrote:
After replacing jpd with a small shell script on Monday 12 Jun 2006
18:35, the following appeared on stdout:
[1] Yes, that's just three wires, and for short lengths a bit of
[telephone cable will do just fine.

*Telephone* cable [1]? Just leave your geek card with the doorman, Mr.
Jpd. All serial cables, whether they be UPS, null modem, for the EPROM
burner or otherwise shall only be made from the best quality, low-loss
category 5 cable - the solid stuff, mind you, so you have to get the
soldering iron out every other time you use them - and never a D shell
nor a piece of neoprene sleeving shall be sighted. Pure hardware
prowess and peer admiration will keep those lines from shorting.
Believe...

*handwave* This is not the short you're looking for! Splendid. Now,
shall we up the ante and do the same with, oh, some 380V triphase will
do, for starters?

I did plan on mentioning CAT5, then went on editing and promptly forgot
about it. Solid stuff is nice but won't stand up against movement as
well as stranded, so is not always practical. And, of course, the
simpler peecee variety doesn't use differential signals so twisting
the pairs is all but useless towards increasing cable quality for this
particular purpose. But I am now forced to ask, what's with this unfair
bias against telco geeking?


[1] Actually, the 3 pair stuff is just one conductor short for a full
null-modem cable. They need seven:

Most often I've seen two pair stuff[1] with an extra nekkid ground wire
thrown in. Some creative combining of signals and it'll do as a serial.


2 -> 3
3 -> 2
5 -> 5 *stop here if you're not using handshaking

See? Three wires. :-p


4 -> 6
6 -> 4
7 -> 8
8 -> 7

The above is for DB9F to DB9F. From memory. I have *no* life :-)

I initially thought ``2,3,7, wasn't it?'', but that's for DB25.
And <ObNitPick> DB9 isn't. </> Reasons why are left as an excercise.


[1] Coloured red, blue, white, orange. This indeed is Dutch telephone
cable I'm talking about. None of that ugly red blue yellow black!

--
j p d (at) d s b (dot) t u d e l f t (dot) n l .
This message was originally posted on Usenet in plain text.
Any other representation, additions, or changes do not have my
consent and may be a violation of international copyright law.
.

Relevant Pages

  • USB to serial cables cause problems
    ... have problems when using a usb to serial cable. ... when the app tries to close the com port. ... until I encountered these usb to serial cables. ...
    (microsoft.public.windowsxp.hardware)
  • USB to Serial device hanging communications thread
    ... have problems when using a usb to serial cable. ... when the app tries to close the com port. ... until I encountered these usb to serial cables. ...
    (microsoft.public.windowsxp.device_driver.dev)
  • Re: Getting a IIgs to play nice with a Mac
    ... imagewriter II & a mac plus, this should let you use appletalk, because it ... The only Mini-Din-8 serial cables ... that are straight through should be extender cables. ... connector in all their major products, ...
    (comp.sys.apple2)
  • Want to use APC BackUPS XS 1000 with FreeBSD
    ... > serial cables, not USB. ... If I hook up the UPS to my FreeBSD system using the USB cable that came ... -- but as far as I can tell, I can't get apcupsd to even try to talk to ...
    (comp.unix.bsd.freebsd.misc)
  • Re: ViewSonic with Serial GPS
    ... you don't a need a null modem and gender changer. ... Pc-mobile cables are much less cumbersome IMHO. ... >> a Garmin eTrex connected through the serial port, ... >> All of these programs with the equivalent serial cables work on several ...
    (microsoft.public.pocketpc)